Add text rendering support to wayland clients

2 files changed, 63 insertions, 0 deletions

diff --git a/wayland/pango.c b/wayland/pango.c
new file mode 100644
index 00000000..9766be6a
--- /dev/null
+++ b/wayland/pango.c
@@ -0,0 +1,59 @@
+#include <cairo/cairo.h>
+#include <pango/pangocairo.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include "client/window.h"
+#include "client/buffer.h"
+#include "log.h"
+
+PangoLayout *get_pango_layout(struct window *window, const char *text) {
+        PangoLayout *layout = pango_cairo_create_layout(window->cairo);
+        pango_layout_set_text(layout, text, -1);
+        PangoFontDescription *desc = pango_font_description_from_string(window->font);
+        pango_layout_set_font_description(layout, desc);
+        pango_layout_set_single_paragraph_mode(layout, 1);
+        pango_font_description_free(desc);
+        return layout;
+}
+
+void get_text_size(struct window *window, int *width, int *height, const char *fmt, ...) {
+        char *buf = malloc(2048);
+
+        va_list args;
+        va_start(args, fmt);
+        if (vsnprintf(buf, 2048, fmt, args) >= 2048) {
+                strcpy(buf, "[buffer overflow]");
+        }
+        va_end(args);
+
+        PangoLayout *layout = get_pango_layout(window, buf);
+        pango_cairo_update_layout(window->cairo, layout);
+
+        pango_layout_get_pixel_size(layout, width, height);
+
+        g_object_unref(layout);
+
+        free(buf);
+}
+
+void pango_printf(struct window *window, const char *fmt, ...) {
+        char *buf = malloc(2048);
+
+        va_list args;
+        va_start(args, fmt);
+        if (vsnprintf(buf, 2048, fmt, args) >= 2048) {
+                strcpy(buf, "[buffer overflow]");
+        }
+        va_end(args);
+
+        PangoLayout *layout = get_pango_layout(window, buf);
+        pango_cairo_update_layout(window->cairo, layout);
+
+        pango_cairo_show_layout(window->cairo, layout);
+
+        g_object_unref(layout);
+
+        free(buf);
+}
diff --git a/wayland/window.c b/wayland/window.c
index 13d4c7b2..916e3b57 100644
--- a/wayland/window.c
+++ b/wayland/window.c
@@ -63,6 +63,7 @@ struct window *window_setup(struct registry *registry, uint32_t width, uint32_t
         window->width = width;
         window->height = height;
         window->registry = registry;
+        window->font = "monospace 10";
 
         window->surface = wl_compositor_create_surface(registry->compositor);
         if (shell_surface) {
@@ -74,6 +75,8 @@ struct window *window_setup(struct registry *registry, uint32_t width, uint32_t
                 wl_pointer_add_listener(registry->pointer, &pointer_listener, window);
         }
 
+        get_next_buffer(window);
+
         window->cursor.cursor_theme = wl_cursor_theme_load("default", 32, registry->shm); // TODO: let you customize this
         window->cursor.cursor = wl_cursor_theme_get_cursor(window->cursor.cursor_theme, "left_ptr");
         window->cursor.surface = wl_compositor_create_surface(registry->compositor);
@@ -118,4 +121,5 @@ int window_render(struct window *window) {
 }
 
 void window_teardown(struct window *window) {
+        // TODO
 }